Airtraffic is a game/simulator that puts you into an air traffic controller's hotseat. Planes come into your airspace from various directions and you have to guide them safely to their destinations. It uses Python, Corba, and GTK.

DroidBattles (formerly known as BattleBots) is a game of programming. The task
is to design your bots and then use the hardware as efficiently as possible by
writing a program for it, with the mission to kill any enemy bots on the
playground.

BZFlag is a 3D, multiplayer, tank battle zone,
capture the flag game that pits players against
each other in a networked environment. It runs on
Windows 95/98/NT/2000, Linux, MacOS 10.x, Irix,
Solaris, and others. An OpenGL accelerator is
highly recommended, but it is playable with 3D in
software.

Cadaver is a simulated world of cyborgs and nature in realtime. The battlefield consists of forests, grain, water, grass, carcass (of course) and lots of other things. The game server manages the game and the rules. You start a server and connect some clients. The clients communicate with the server using a very primitive protocol. They can order cyborgs to harvest grain, attack enemies or cut forest. The game is not intended to be played by humans! Instead the idea is that you write artificial intelligence clients to beat the other artificial intelligences.

dopewars is a UNIX rewrite of the MS-DOS program of the same name, which in turn was inspired by John E. Dell's "Drug Wars" game. You have one month to buy and sell drugs on the streets of New York, the aim being first to pay off your debt to the loan shark and then to make a fortune. And if you have to shoot a few cops in the process, well... The game includes TCP networking allowing you to meet (and shoot) other human drug dealers. Computer drug dealers are currently in development.